碱改性对ZSM-5分子筛的影响及甲醇制丙烯催化性能研究  

Effect of ZSM-5 Zeolites by Alkali-Treatment and Their Catalytic Performance for Methanol to Propylene Reaction

作　　者：安良成 王林[1] 江永军[1] 刘素丽[1] 庄壮[1] 雍晓静[1] 罗春桃[1] 

机构地区：[1]神华宁夏煤业集团有限责任公司煤制油化工研发中心,宁夏银川750411

出　　处：《分子催化》2016年第5期444-453,共10页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金国际(地区)合作与交流(批准号:2015DFA40660)项目资助~~

摘　　要：在高浓度体系下,以粗孔硅胶和偏铝酸钠为原料,TPABr为模板剂,水热晶化法制备了ZSM-5分子筛,单釜产率23%.用不同浓度的氢氧化钠溶液对ZSM-5分子筛进行改性,采用XRD、FT-IR、SEM、NH_3-TPD、XRF、N_2物理吸附等方法对改性前后的样品进行了表征,并考察了改性后ZSM-5分子筛甲醇催化转化制丙烯(MTP)反应性能.结果表明,氢氧化钠改性未破坏分子筛的骨架结构,改性后样品的酸量、介孔孔容和BET比表面积均有增加,从而改善了催化剂的抗积碳性能和反应性能.在MTP反应中,增产丙烯的效果不明显,但表现出了更好的催化稳定性(催化剂使用寿命从85 h提升至110 h),并且有利于提高副产物汽油组分(∑C5+)的产量.ZSM-5 zeolites were synthesized by hydrothermal crystallization method and using macroporous silica gel and sodium aluminate as raw materials and TPABr as template. The batch yield was 23%. ZSM-5 zeolite were modified by different concentration sodium hydroxide solution and characterized by XRI）, FT-IR, SEM, NH3-TPD, XRF and nitrogen adsorption, and their catalytic performance for methanol to propylene （MTP） reaction was evaluated. The results showed that the framework structure of sample was scarcely damaged after modification, the acid content, mesopores pore volume BET surface area and the performance of resistance to carbon deposition were in-creased and the catalytic cracking performances of modified ZSM-5 catalyst was improved. In MTP process, the modified samples could not increase the yield of propylene, but the modified samples exhibited noticeable enhancement in catalytic stability （the life time from 85 h to 110 h） and the yield of gasoline （ΣC5＋）.

关 键 词：高浓度体系 ZSM-5分子筛 碱处理 甲醇制丙烯 

分 类 号：TQ426[化学工程] O643[理学—物理化学]